Ignoring unknown pkt types, related to #16.  Thanks for contributing!

This change modifies the behaviour of the driver in case an
unknown packet type is encountered. Previously, the deserialisation
routine would raise an exception, which would cause the driver
to print an error and exit.

In the current implementation the unknown packet type(s) are
stored, their payload ignored, and the driver reports the fact that
unknown type(s) was/were received (with a request to report the
warning, ideally to the package maintainer).

This is not a solution for #16, although that issue prompted this
change.

issue #20 - added corrected mesh file

Added definitions for adding tergets in install folder. Issue #10.

Update to moveit_simple_controller_manager

UR driver updated to work with new 1.7 version software.  Software tested for backwards compatibility. 

Updated to catkin.  ur_driver's files were added to nested Python directory for including in other packages.

added IKfast compatibility functions

Gazebo fixes

Swri internal mods

Added launch/configuration files for using real robot.  Updated joint limits to velocity limits of the driver (all of which can be configured to make the robot move faster)

Swri internal mods

Removed ur5_joint_limited_moveit_config.  ur5_moveit_config now has limited joint ranges to plus/minus 180 degrees.

Added joint limited urdf and associated moveit package.  The joint limited package is friendlier to the default KLD IK solution

Added ur5 moveit library.  The Kinematics used by the ur5 move it library is unreliable and should be replaced with the ur_kinematics

Ported ur_kinematics package from Georgia Tech library.  Added ability to create ur5 & ur10 kinematics libraries.  Python libaries not untested.  Kinematics still needs to be wrapped within Kinematics plugin interface